<?php

class Dbstuff {
var $querynum = 0;
var $link;
var $histories;

var $dbhost;
var $dbuser;
var $dbpw;
var $dbcharset;
var $pconnect;
var $tablepre;
var $time;

var $goneaway = 5;//note 最多重试几次

function connect($dbhost='216.158.86.202', $dbuser='av194', $dbpw='allen123', $dbname = 'av', $dbcharset = 'utf8', $pconnect = 1, $tablepre='', $time = 0) {
//function connect($dbhost='10.52.21.3', $dbuser='apenweb', $dbpw='allen123', $dbname = 'av', $dbcharset = 'utf8', $pconnect = 1, $tablepre='', $time = 0) {
$this->dbhost = $dbhost;
$this->dbuser = $dbuser;
$this->dbpw = $dbpw;
$this->dbname = $dbname;
$this->dbcharset = $dbcharset;
$this->pconnect = $pconnect;
$this->tablepre = $tablepre;
$this->time = $time;

if($pconnect) {
if(!$this->link = mysql_pconnect($dbhost, $dbuser, $dbpw)) {
$this->halt('Can not connect to MySQL server');
}
} else {
if(!$this->link = mysql_connect($dbhost, $dbuser, $dbpw)) {
$this->halt('Can not connect to MySQL server');
}
}

if($this->version() > '4.1') {
if($dbcharset) {
mysql_query("SET character_set_connection=".$dbcharset.", character_set_results=".$dbcharset.", character_set_client=binary", $this->link);
}

if($this->version() > '5.0.1') {
mysql_query("SET sql_mode=''", $this->link);
}
}

if($dbname) {
mysql_select_db($dbname, $this->link);
}

}

function fetch_array($query, $result_type = MYSQL_ASSOC) {
return mysql_fetch_array($query, $result_type);
}

function result_first($sql) {
$query = $this->query($sql);
return $this->result($query, 0);
}

function fetch_first($sql) {
$query = $this->query($sql);
return $this->fetch_array($query);
}

function fetch_all($sql, $id = '') {
$arr = array();
$query = $this->query($sql);
while($data = $this->fetch_array($query)) {
$id ? $arr[$data[$id]] = $data : $arr[] = $data;
}
return $arr;
}

function cache_gc() {
$this->query("DELETE FROM {$this->tablepre}sqlcaches WHERE expiry<$this->time");
}

function query($sql, $type = '', $cachetime = FALSE) {
$func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query';
if(!($query = $func($sql, $this->link)) && $type != 'SILENT') {
$this->halt('MySQL Query Error', $sql);
}
$this->querynum++;
$this->histories[] = $sql;
return $query;
}

function affected_rows() {
return mysql_affected_rows($this->link);
}

function error() {
return (($this->link) ? mysql_error($this->link) : mysql_error());
}

function errno() {
return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());
}

function result($query, $row) {
$query = @mysql_result($query, $row);
return $query;
}

function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}

function num_fields($query) {
return mysql_num_fields($query);
}

function free_result($query) {
return mysql_free_result($query);
}

function insert_id() {
return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);
}

function fetch_row($query) {
$query = mysql_fetch_row($query);
return $query;
}

function fetch_fields($query) {
return mysql_fetch_field($query);
}

function version() {
return mysql_get_server_info($this->link);
}

function close() {
return mysql_close($this->link);
}

function insert_string($table = '',$row = array()){
  if(!$table || !$row){
    return false;
  }
  $fields = array();
  $dest = array();
  foreach($row as $k => $v){
     $fields[] = sprintf('`%s`',mysql_real_escape_string($k));
     $dest[] = sprintf('\'%s\'',mysql_real_escape_string($v));
  }
  $fields = implode(',',$fields);
  $dest = implode(',',$dest);
  $sql = sprintf('INSERT INTO `%s`(%s) VALUES (%s)',mysql_real_escape_string($table),$fields,$dest);
  return $sql;
}

function update_string($table,$row,$where){
  if(!$table || !$row || !is_array($where)){
     return false;
  }
  $fields = array();
  foreach($row as $k => $v){
     $fields[] = sprintf('`%s` = \'%s\'',mysql_real_escape_string($k),mysql_real_escape_string($v));
  }
  $dest = '';
  foreach($where as $k => $v){
     $dest .= $dest ? ' AND ' : '';
     $dest = sprintf(' `%s` = \'%s\' ',mysql_real_escape_string($k),mysql_real_escape_string($v));
  }

  $fields = implode(',',$fields);
  $sql = sprintf('UPDATE `%s` SET %s WHERE %s',mysql_real_escape_string($table),$fields,$dest);
  return $sql;
}

function halt($message = '', $sql = '') {
$error = mysql_error();
$errorno = mysql_errno();
if($errorno == 2006 && $this->goneaway-- > 0) {
$this->connect($this->dbhost, $this->dbuser, $this->dbpw, $this->dbname, $this->dbcharset, $this->pconnect, $this->tablepre, $this->time);
$this->query($sql);
} else {
$s = '';
if($message) {
$s = "<b>UCenter info:</b> $message<br />";
}
if($sql) {
$s .= '<b>SQL:</b>'.htmlspecialchars($sql).'<br />';
}
$s .= '<b>Error:</b>'.$error.'<br />';
$s .= '<b>Errno:</b>'.$errorno.'<br />';
$s = str_replace(UC_DBTABLEPRE, '[Table]', $s);
exit($s);
}
}
}


?>
